OS 10.5 - Remove User

Hello, I would like to know how to remove a user from my Mac.
When in Finder I have Devices, Shared, Places etc.. Under the Shared folder I have Stephen? I would like to remove this and add another user.
Thanks.

If it bothers you that badly you can always go to Finder, then hit Command+J (Show view options). In that menu you under one of those tabs (can't remember which one) you can uncheck the option to show the networked computers on the sidebar.

HOWEVER, if you are on your own network at home, I would really recommend trying to figure out who else is using your network. If your network at home is wireless and unsecured, I would secure it immediately becuase this means someone is mooching off your Internet.